SU1328670A1 - Device for measuring position of hot rolled stock edge - Google Patents

Abstract

This invention relates to a measurement technique. The purpose of the invention is to improve the measurement accuracy by eliminating unreliable information when entering the rolled edge in the visual field of the optical system. The image of the edge of hot rolled steel 11 is projected by the optical system 1 onto the device 2 with charge coupling. The video signal envelope is extracted by the envelope selection unit 5. The temporal position of the video signal envelope front associated with the position of the edge of the hot-rolled steel 11 is measured by the measuring unit 6. The two-level comparator 7, the switch 3, the exposure time control unit 4 and the control unit 3 control the photosensitivity of the device 2 with the charge level zyu. When the hot-rolled edge 11 enters the field of vision of the optical system 1 when the light-sensitive areas of the device 2 are saturated with charge coupling, the discriminator 8 generates a signal blocking the measuring unit 6 and the switch 9. The signal from the amplitude discriminator 8 goes through the input of the accumulation time control unit 4 and reduces the photosensitivity of the device 2 with charge coupling. 3 il. S (L with tc oo O)

Description

The invention relates to a measurement technique and can be used to measure the position of a hot rolled edge.

The aim of the invention is to improve the measurement accuracy by eliminating unreliable information when entering the rental edge in the field of vision of the optical system and optical interference.

FIG. 1 shows a functional diagram of the device; in fig. 2 - a video signal and a video signal envelope generated at the output of the device with a charge coupling and an envelope selection unit in the established measurement mode; in fig. 3 video signal and a video signal envelope generated at the output of the device with a charge coupling and an envelope selection block at the entrance of the hot rolled edge in the visual field of the optical system.

The device contains an optically coupled optical system 1, a multi-element photo-receiver made on the device 2 with charge coupling, control unit 3, the output of which is connected to device 2 with charge coupling, unit 4 for controlling the accumulation time, the output of which is connected to block 3 control unit 5, the selection of the envelope, the input of which is connected to the output of the device with charge coupling, the measuring unit 6, the information input of which is connected to the output of the block 5 of the selection of the envelope, two-level comparator 7, the input of which is connected to the path of the envelope selection block, the amplitude discriminator 8, the input of which is connected to the output of the device 2 with charge connection, the switch 9, the first and second information inputs of which are connected to the outputs of the two-level comparator 7, the control input of the switch 9 is connected to the output of the amplitude discriminator 8, the logical element OR 10, the first and second inputs of which are connected respectively to the first output of the switch 9 and the output of the amplitude discriminator 8, the output of the logical element OR 10 is connected to the first input of the control unit 4 Rovani storage time, the second input of which is connected to the second output of the switch 9, the control input of the measuring unit 6 connected to the output of the amplitude discriminator 8.

The position of the hot-rolled edge 11 is measured.

The device works as follows.

The edge of the moving hot-rolled steel 11 is projected by the optical system 1 onto the photosensitive surface of the device 2 with charge coupling. The control unit 3 periodically generates control signals arriving at the device 2 with charge

0

five

0

five

0

five

0

five

0

five

by communication. At the output of device 2 with charge coupling, a video signal is formed, the envelope of which is proportional to the distribution of illumination on the photosensitive surface of device 2 with charge coupling (Fig. 2).

The video signal envelope is extracted by the envelope extraction unit 5, the output signal from which goes to the information input of the measuring unit 6. The latter measures the time position of the front of the signal coming from the envelope selection 5, at a level proportional to, for example, half the maximum value of the signal. The temporal position of the signal front is associated with a certain scale factor with the spatial position of the hot rolled edge 11.

The two-level comparator 7 performs a threshold control of the amplitude of the information signal taken from the output of the envelope extraction unit 5 at two levels.

By increasing the amplitude of the signal removed from the output of the envelope selection block 5 to the upper threshold value, the two-level comparator 7 generates a control signal which through the switch 9 goes to the second control input of the accumulation time control unit 4, which with the help of the control unit 3 reduces the accumulation time charges in device 2 with charge coupling, which leads to a decrease in the amplitude of the information signal taken from the output of the envelope extraction unit 5.

When the amplitude of the signal removed from the output of the envelope selection block 5 decreases to a lower threshold value, the two-level comparator 7 generates a control signal which through the switch 9 and the OR 10 logic element is fed to the first control input of the accumulation time control unit 4, which by block 3 control increases the accumulation time of charges in the device 2 with charge coupling, which leads to an increase in the amplitude of the signal taken from the output of the envelope extraction unit 5.

Thus, by varying the sensitivity of the device 2 with charge coupling, the amplitude of the information signal taken from the envelope extraction unit 5 is maintained within a certain tolerance interval.

When the edge of the hot-rolled product leaves the field of the optical system 1, the sensitivity of the device 2 with charge coupling is automatically set to maximum due to the reduction of the amplitude of the information signal to zero.

When the edges of the high-temperature hot rolled in the field of view of the optical system 1 enter, the photosensitive areas of the device 2 with a charge connection become saturated, which leads to the distortion of the front of the information signal taken from the output of the envelope extraction unit 5.

At the same time, at the output of the amplitude discriminator 8, which is set to the discrimination level, below the saturation level of the information signal taken from the output of the device 2 with the charge coupling, a signal is generated that goes to the control input of the measuring unit 6 and prohibits the measurement of the temporal position of the front of the measuring signal . The signal generated at the output of the amplitude discriminator 8 also blocks the switch 9 and, via the OR 10 element, enters the first input of the accumulation time control unit 4, reducing the charge accumulation time in the charge-coupled device 2.

The accumulation time decreases until the amplitude of the signal taken from the output of the device 2 with charge coupling decreases to a value smaller than the amplitude corresponding to the saturation of the photosensitive elements of the device 2 with charge coupling. This removes the inhibit signal to the input of the measuring unit 6 and opens the switch 9.

The use of the device eliminates the passage of unreliable information into the measuring unit in the presence of optical interference (steam, scale) and the entrance of the hot rolled edge in the field of view of the optical system of the device, provides an adaptation

multielement photodetector to a change in measurement conditions.

Claims (1)

Invention Formula A device for measuring the position of the hot rolled edge containing an optically coupled optical system, a multi-element photo-receiver made on a charge-coupled device, a control unit whose output is connected to a charge-linked device, an accumulation time control unit, the output of which is connected with the control unit, the envelope selection unit whose input is connected 5 to the output of the device with a charge coupling, the measuring unit, the information input of which is connected to the output of the envelope selection unit, a two-level comparator, the input of which is connected to the output of the envelope selection unit, characterized in that it is equipped with an amplitude discriminator to increase the measurement accuracy The input of which is connected to the output of the device with charge coupling, switch, the first and second information 5 inputs of which are connected to the output of a two-level comparator, the control input of the switch is connected to the output of the amplitude discriminator, the OR logical element, the first and second inputs of which  Podschuyeny respectively to the first output of the switch and the output of the amplitude discriminator, the output of the logic element OR is connected to the first input of the accumulation time control unit, the second input of which is connected to the second output from the switch, the measuring unit is equipped with a control input connected to the output of the amplitude discriminator. Have R / hz Editor O. Yurkovetskaya Order 3474/43 Compiled by T. Tehred I. Veres Corrector A. Znmokosov Circulation 676 Subscription VNIIPI USSR State Committee for the De. Pp. Inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4